Schott SSK 4A, 334nm - 2325nm
USER
2 1
SQRT(1+B1*wvl^2/(wvl^2-C1)+B2*wvl^2/(wvl^2-C2)+B3*wvl^2/(wvl^2-C3))
0
B1	1.38336169E+00;
B2	1.87125107E-01;
B3	9.44170902E-01;
C1	7.87154985E-03;
C2	2.89352221E-02;
C3	1.05742424E+02;